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Rates of reactions

In this section, you will be assessed on your ability to:

4.17 describe experiments to investigate the effects of changes in surface area of a solid, concentration of solutions, temperature and the use of a catalyst on the rate of a reaction
4.18 describe the effects of changes in surface area of a solid, concentration of solutions, pressure of gases, temperature and the use of a catalyst on the rate of a reaction
4.19 understand the term ‘activation energy’ and represent it on a reaction profile
4.20 explain the effects of changes in surface area of a solid, concentration of solutions, pressure of gases and temperature on the rate of a reaction in terms of particle collision theory
4.21 explain that a catalyst speeds up a reaction by providing an alternative pathway with lower activation energy.

Section notes

Section 4 c rates of reactions.doc

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Book

Chapter 6 pages 41 to 51

Investigations

Resources

Animations

surface area
factors affecting rates
sodium thiosulphate reaction
Alternatively use this one on eChalk; you will need to use a username and password which you can get from me: rates of reactions
rates of reactions animation 1

Worksheets

Images

Activation energy

Activation energy can be thought of as a hill which particles need to climb before they can be changed into products

Activation energy on a reaction profile or energy level diagram

Revision

Use this site to help you to revise - it also contains a few simple animations: sciencepages
You can also use the following two BBC bitesize ones, each from a different exam board:
1. http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/rocks_metals/7_faster_slower6.shtml
2. http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/chemreac/ratesrev1.shtml